save project

snake.py

@@ -24,8 +24,8 @@ while True:
     x +=30
     x +=30
     position.append((x,y))
     position.append((x,y))
     position.pop(0)
     position.pop(0)
-
-
+    if x < 0 or x > 630 or y < 0 or y > 450:
+        exit() 
     # 将背景图画上去
     # 将背景图画上去
     screen.blit(background, (0, 0))
     screen.blit(background, (0, 0))
     # 将贪吃蛇画上去
     # 将贪吃蛇画上去